Haas 145-148 alarm: X/Y/Z/A limit switch

Haas detects limit switch or physical limit on the indicated axis. It is an alarm from the Sobrecarrera area, and in the catalog it is listed as “X/Y/Z/A limit switch”. On the machine you notice it like this: Axis locked at limit, It does not allow movement in one direction, May appear during homing.

On the shop floor it almost always comes from one of these causes: Movimiento fuera de carrera, Limit switch activated or damaged, Offset incorrecto, Chips or a knock on the limit switch. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Release limit and reset after correcting cause. Resetting without fixing the cause first only hides the problem: Haas 145-148 trips again and, in the meantime, you keep working with the machine in bad shape.

With the machine stopped and in a safe state, start with these checks: Identify the axis, Leave in a safe direction with the Haas procedure, Check offset/program. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Haas 145-148 active, avoid this: Do not bypass safety devices, Do not manipulate energized electrical cabinet, Do not continue producing if the alarm reappears. Skipping any of these points is what turns a minor stop into an expensive breakdown.

If the switch does not release or there is mechanical damage. If you are not sure how far it goes, stop the machine and report it: a repeat alarm always works out cheaper than a crash.

It is a stop alarm: the cycle will not continue until you fix the cause. It does not always mean serious damage, but it leaves the machine where it is and you have to check it before running again. Guidance reference. Always confirm the full text in the exact machine/control manual.